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  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
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<script>
  // [3,4,1,2,6,5] ---> [1,2,3,4,5,6] 
  var arr = [3,4,1,2,6,5];
  arr.sort((a, b) => a- b);
  console.log(arr);


</script>
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